John Freeman
Software Engineer at Citadel
New York, New York, United States
Summary
🤩
Rockstar🎓
Top SchoolJohn Freeman is a seasoned software engineer with 17 years of experience building robust back-end systems and contributing to high-performance C++ codebases. Based in New York, he recently joined Citadel after four impactful years at Ripple where he advanced the XRP Ledger daemon (rippled), improving URL parsing, JSON handling, and documentation workflows while fixing critical security and networking issues. His background includes quant-focused engineering at Two Sigma and long-standing open-source work dating back to GCC/Clang contributions and a JavaScript MVVM library he led at Texas A&M. A PhD-trained developer, he blends deep systems-level expertise with production-grade engineering practices and a history of solving low-level protocol and compiler challenges. Notably, his contributions to a flagship blockchain implementation demonstrate both meticulous code hygiene and an ability to improve developer tooling and resiliency.
17 years of coding experience
18 years of employment as a software developer
edXDoctor of Philosophy (PhD) Computer Science, Doctor of Philosophy (PhD) Computer Science at Texas A&M UniversityUniversity of North Texas
English
Stackoverflow
2,652reputation
509kreached
18answers
55questions
Github Skills (16)
regular-expression10
c-language10
xrp10
cprogramming-language10
cryptography10
blockchain9
cpp9
json9
cmake8
build-automation8
powershell6
ctest6
react-router6
kendo-ui6
documentation6
Programming languages (25)
Github contributions (5)
XRPLF/rippled
Nov 2018 - Jan 2023
Decentralized cryptocurrency blockchain daemon implementing the XRP Ledger protocol in C++
Role in this project:
Back-end Developer
Back-end DeveloperContributions:578 reviews, 32 commits, 106 PRs in 4 years 2 months
Contributions summary:John primarily focused on improving the `rippled` codebase, a C++ implementation of the XRP Ledger protocol. Their contributions include refactoring the URL parsing mechanism using regular expressions, adding missing string conversions for JSON objects, and fixing issues related to command-line arguments. Furthermore, they addressed a technical flaw by preventing the use of the master key as the regular key and improved the Doxygen workflow for documentation generation. They also added support for reserved peer slots and made various other code improvements.
cryptographycppxrpldaemonblockchain
thejohnfreeman/jfdoc
Mar 2012 - Apr 2012
Contributions:207 commits in 1 month
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